Troubleshooting

Symptom Troubleshooting
i06219299
Acceleration Is Poor or
Throttle Response Is Poor
Probable Causes
• Diagnostic codes
• Parameters in the Electronic Control Module
(ECM)
• Throttle Position Sensor/Throttle Switches
• Air intake and exhaust system
• Valve lash
• Turbocharger
• Fuel supply
• Low compression (cylinder pressure)
• Electronic unit injectors
• Individual malfunctioning cylinder
Recommended Actions
NOTICE
Do not crank the engine continuously for more than
30 seconds. Allow the starting motor to cool for two
minutes before cranking the engine again.
Note: The procedures have been listed in order of
probability. Complete the procedures in order.
Note: If the problem only occurs under certain
conditions, test the engine under those conditions.
Examples of certain conditions are high engine
speed, full load, and engine operating temperature.
Troubleshooting the symptoms under other
conditions can give misleading results.
UENR0612-07 31
Symptom Troubleshooting
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